ENUM NFT_EXTHDR_ATTRIBUTES(9)

🦋 enum nft_exthdr_attributes(9) — the Kernel API Manual ✨

okay so bestie, we're in the <pink>Kernel API Manual</pink> today and the star of the show is enum nft_exthdr_attributes — it's an <purple>enum</purple>, it lives in the kernel, and it's literally the whole vibe-check list of netlink attributes for the <mint>nf_tables</mint> extension header expression. yes. that. 🎀

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💖 NAME 💖

enum nft_exthdr_attributes — nf_tables extension header expression netlink attributes 🫶

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🌸 SYNOPSIS 🌸

enum nft_exthdr_attributes {
    NFTA_EXTHDR_UNSPEC ,
    NFTA_EXTHDR_DREG ,
    NFTA_EXTHDR_TYPE ,
    NFTA_EXTHDR_OFFSET ,
    NFTA_EXTHDR_LEN ,
    NFTA_EXTHDR_FLAGS ,
    NFTA_EXTHDR_OP ,
    NFTA_EXTHDR_SREG ,
    __NFTA_EXTHDR_MAX

};

like, that's the whole squad right there 👑 nine members, no notes.

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⭐ Constants ⭐

okay so let's meet the cast, one by one, no skipping, no cap 💅

• NFTA_EXTHDR_UNSPEC — <lavender>-- undescribed --</lavender> 🙈 yeah that's literally all the docs say. it's the mystery member and honestly? iconic for that.
• NFTA_EXTHDR_DREG — the <hotpink>destination register</hotpink> (and the type is NLA_U32: nft_registers). this is where the answer lands, bestie.
• NFTA_EXTHDR_TYPE — the <cyan>extension header type</cyan> (type: NLA_U8). tiny lil 8-bit guy.
• NFTA_EXTHDR_OFFSET — the <peach>extension header offset</peach> (type: NLA_U32).
• NFTA_EXTHDR_LEN — the <yellow>extension header length</yellow> (type: NLA_U32).
• NFTA_EXTHDR_FLAGS — the <green>extension header flags</green> (type: NLA_U32).
• NFTA_EXTHDR_OP — the <blue>option match type</blue> (type: NLA_U32).
• NFTA_EXTHDR_SREG — the <purple>source register</purple> (type NLA_U32: nft_registers). this is where we're reading from, so slay.
• __NFTA_EXTHDR_MAX — <lavender>-- undescribed --</lavender> 💀 again, the docs said nothing. she's mysterious. we respect her.

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🌈 SEE ALSO 🌈

fr fr go read the source, it's all right here:

• Kernel file ./include/uapi/linux/netfilter/nf_tables.h enum
• nft_registers(9), enum nft_verdicts(9), enum nf_tables_msg_types(9)
• enum nft_list_attributes(9), enum nft_hook_attributes(9), enum nft_table_flags(9)
• enum nft_table_attributes(9), enum nft_chain_attributes(9), enum nft_rule_attributes(9)
• enum nft_rule_compat_flags(9), enum nft_rule_compat_attributes(9), enum nft_set_flags(9)
• enum nft_set_policies(9), enum nft_set_desc_attributes(9), enum nft_set_field_attributes(9)
• enum nft_set_attributes(9), enum nft_set_elem_flags(9), enum nft_set_elem_attributes(9)
• enum nft_set_elem_list_attributes(9), enum nft_data_types(9), enum nft_data_attributes(9)
• enum nft_verdict_attributes(9), enum nft_expr_attributes(9), enum nft_immediate_attributes(9)
• enum nft_bitwise_ops(9), enum nft_bitwise_attributes(9), enum nft_byteorder_ops(9)
• enum nft_byteorder_attributes(9), enum nft_cmp_ops(9), enum nft_cmp_attributes(9)
• enum nft_range_ops(9), enum nft_range_attributes(9), enum nft_lookup_attributes(9)
• enum nft_dynset_attributes(9), enum nft_payload_bases(9), enum nft_payload_csum_types(9)
• enum nft_payload_attributes(9), enum nft_exthdr_op(9), enum nft_meta_keys(9)
• enum nft_rt_keys(9), enum nft_hash_types(9), enum nft_hash_attributes(9)
• enum nft_meta_attributes(9), enum nft_rt_attributes(9), enum nft_socket_attributes(9)
• enum nft_ct_keys(9), enum nft_ct_attributes(9), enum nft_offload_attributes(9)
• enum nft_limit_attributes(9), enum nft_connlimit_attributes(9), enum nft_counter_attributes(9)
• enum nft_last_attributes(9), enum nft_log_attributes(9), enum nft_log_level(9)
• enum nft_queue_attributes(9), enum nft_quota_attributes(9), enum nft_secmark_attributes(9)
• enum nft_reject_types(9), enum nft_reject_inet_code(9), enum nft_reject_attributes(9)
• enum nft_nat_types(9), enum nft_nat_attributes(9), enum nft_tproxy_attributes(9)
• enum nft_masq_attributes(9), enum nft_redir_attributes(9), enum nft_dup_attributes(9)
• enum nft_fwd_attributes(9), enum nft_objref_attributes(9), enum nft_gen_attributes(9)
• enum nft_object_attributes(9), enum nft_flowtable_flags(9), enum nft_flowtable_attributes(9)
• enum nft_flowtable_hook_attributes(9), enum nft_osf_attributes(9), enum nft_synproxy_attributes(9)
• enum nft_devices_attributes(9), enum nft_trace_attributes(9), enum nft_ng_attributes(9)

like, that's the entire friend group and they're all invited to the function 🧚

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ok that's the whole page, bestie. <rainbow>go read nf_tables.h and have the best day ever</rainbow> 💖

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mwah 💋 this little number came out of ./include/uapi/linux/netfilter and it's dated <hotpink>October 2026</hotpink> — screenshot it, memorise it, tell your friends. bye bestie!! 🍓✨